Flynn Alternatives for Self-Hosted

CapRover is an free and easy-to-use application deployment and server manager for NodeJS, Python, PHP, ASP.NET, Ruby, MySQL, MongoDB, Postgres, WordPress and more. With CapRover you can create your own PaaS (Platform-as-a-Service) similar to that of Heroku, and deploying it to your own cloud instance.

Dokku is a free and open-source project that helps you build and manage the lifecycle of applications. With Dokku developers can setup their own PaaS (Platform-as-a-Service) in a matter of minutes. Dokku provides extra plugins which can be used to manage database, and tools needed for your application. If you need to server your application over HTTPS, Dokku got you covered as well, with the help of Let's Encrypts free TLS certificates.

aaPanel is a free and open source web hosting control panel. It's a simple, yet powerful control panel that provides one click installs for LNMP and LAMP development stacks through an intuetive graphical user interface (GUI). aaPanel was designed to help you save time when deploying web sites and applications to the web. Allowing you to focus on building your project, rather than focusing on installation and configuration of servers and tooling. Over 3 million people use aaPanel to create quickly deployable web environments for Apache HTTP Server, Nginx and OpenLiteSpeed.

Virtualmin is a powerful and flexible web hosting control panel for Linux and BSD systems. Virtualmin provides a cost-effective and comprehensive solution to virtual web hosting management. Virtualmin is avalible as a commnuity-supported version, while a commercial option includes premium support and more features. Currently, over 100,000 people and organizations use Virtualmin globally.

Webmin is a web-based interface for system administration tool for Unix-like systems. You can use Webmin in any modern browser to setup and manage& user accounts, Apache web server, DNS configuration and alike. The software removes the mundane task of manually editing Unix configurations and allow you to easily setup hosting for applications, sites and web services.

OpenFaaS makes it simple to deploy both functions and existing code to Kubernetes. With OpenFaaS developers can deploy their applications and serveless functions to their very own scalable, fault-tolerant event-driven serverless platform powered by Docker and Kubernetes.

CyberPanel is a web hosting control panel that natively supports LiteSpeed Web Server, Email, DNS and FTP server and high performance, lightweight and a drop-in Apache replacement. The software free to use, but is also provided as CyberPanel Enterprise, with extended features for organizations with more requirements.

ZPanel is a free web hosting control panel for macOS, Linux and Windows-based servers. With ZPanel it's easy to manage your server for web hosting related tasks such as setting up server environments, managing DNS reccords and configuring SMTP.  The software is written in PHP and released as open source software under the GNU General Public License 3.0.

Swarmlet is a free and open-source, self-hosted Platform as a Service that runs on any single server. It's mainly intended for use with multiple servers, a server cluster / swarm. Swarmlet is inspired by Dokku and brings the same simplicity to Docker Swarm. Swarmlet also uses Traefik v2 and Let's Encrypt to provide automatic SSL and load balancing on your apps.